MA-ANT-21 in operation on the bottom R connectors on 5 MR74s all over my property which seem to be doing ok. Why would you need to use the dual band variant on a single band radio?
Networking geek since high school where I got half of a CCNA. Played Marathon II and Infinity over localtalk. Made many a network over the years, now de facto admin of a retreat center with some of this fine Meraki hardware. Fortune 100 Tech veteran/refugee.